package com.javafactroy.kunlong.common.utils;

import org.apache.commons.lang.StringUtils;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class AppStrUtil {
    public static final char UNDERLINE = '_';

    private AppStrUtil() {
    }

    public static boolean isNotBlank(String a) {
        return StringUtils.isNotBlank(a);
    }

    public static String trimToEmpty(String str) {
        return StringUtils.trimToEmpty(str);
    }

    public static boolean isBlank(String str) {
        return StringUtils.isBlank(str);
    }


    /**
     * 将驼峰转换成"_"(userId:user_id)
     *
     * @param param
     * @return
     */
    public static String camelToUnderline(String param) {
        if (param == null || "".equals(param.trim())) {
            return "";
        }
        int len = param.length();
        StringBuilder sb = new StringBuilder(len);
        for (int i = 0; i < len; i++) {
            char c = param.charAt(i);
            if (Character.isUpperCase(c)) {
                sb.append(UNDERLINE);
                sb.append(Character.toLowerCase(c));
            } else {
                sb.append(c);
            }
        }
        return sb.toString();
    }

    /**
     * 将"_"转成驼峰(user_id:userId)
     *
     * @param param
     * @return
     */
    public static String underlineToCamel(String param) {
        if (param == null || "".equals(param.trim())) {
            return "";
        }
        int len = param.length();
        StringBuilder sb = new StringBuilder(len);
        for (int i = 0; i < len; i++) {
            char c = param.charAt(i);
            if (c == UNDERLINE) {
                if (++i < len) {
                    sb.append(Character.toUpperCase(param.charAt(i)));
                }
            } else {
                sb.append(c);
            }
        }
        return sb.toString();
    }

    /**
     * 将"_"转成驼峰(user_id:userId)
     *
     * @param param
     * @return
     */
    public static String underlineToCamel2(String param) {
        if (param == null || "".equals(param.trim())) {
            return "";
        }
        StringBuilder sb = new StringBuilder(param);
        Matcher mc = Pattern.compile(UNDERLINE + "").matcher(param);
        int i = 0;
        while (mc.find()) {
            int position = mc.end() - (i++);
            String.valueOf(Character.toUpperCase(sb.charAt(position)));
            sb.replace(position - 1, position + 1, sb.substring(position, position + 1).toUpperCase());
        }
        return sb.toString();
    }

    public static String format(String str, Object... params) {
        int size = params.length;
        int i = 0;
        while (i < size) {
            str = StringUtils.replace(str, "{}", params[i++].toString(), 1);
        }
        return str;
    }

}

